Some preserves are closed to protect sensitive areas or natural features.
Others are life estates, where a land donor lives and retains land use rights.
| Name | Acreage |
|---|---|
| Munro Nature Preserve | 25.6 |
| Name | Acreage |
|---|---|
| Cedar Creek Bottoms Nature Preserve | 11 |
| Cedar Creek Nature Preserve | 17 |
| Chuck and Sharon Bodenhafer | 8 |
| Cypress Meadow | 19 |
| D and J Eel River | 22 |
| Dorothy and Ray Garman Nature Preserve | 84 |
| Ellenwood Nature Preserve | 4 |
| Emanuel M. Popp Nature Preserve | 76 |
| Emilian Woods | 11 |
| Founders Forest | 210 |
| Fox Fire Woods | 7.9 |
| Herman F. Hammer Wald Nature Preserve | 70 |
| Hutsell Brogan Preserve | 53.7 |
| James M. & Patricia D. Barrett Oak Hill Nature Preserve | 108 |
| Jessie’s Woods Nature Preserve | 30 |
| LaSalle Family Natural Area | 75 |
| Little Cedar Creek Wildlife Sanctuary Nature Preserve | 19 |
| Little Wabash River Nature Preserve | 24 |
| Mackel Nature Preserve | 34 |
| Maumee River Overlook | 1 |
| Mills-Black Nature Preserve | 11 |
| Orion Woods | 30 |
| Raymond and Mildred Wetter Nature Preserve | 40 |
| Roberts' Woods on Cedar Creek | 20.4 |
| Shure Acre | 1 |
| The Mackel Family Nature Preserve | 47 |
| Name | Acreage |
|---|---|
| Kenneth Goble Nature Preserve | 98 |
| Name | Acreage |
|---|---|
| Preston Island | 23 |
| Name | Acreage |
|---|---|
| Claxton Woods | 93 |
| James M. & Patricia D. Barrett Oak Hill Nature Preserve | 139 |
| Sliger Protected Land | 18 |
| Name | Acreage |
|---|---|
| Caprarotta Family Natural Area | 29 |
| Conley Woods Nature Preserve | 100 |
| Eby Bog | 33 |
| Wesdorp Nature Preserve | 38 |
| Name | Acreage |
|---|---|
| Steve Richie | 36 |
| Name | Acreage |
|---|---|
| Doerman Nature Preserve | 38 |
| Little River Landing | 53 |
| Philip and Jean Ross Preserve | 23 |
| Victory Noll Acres | 107 |
| Name | Acreage |
|---|---|
| John Cring Memorial Forest | 40 |
| Madison Township School Nature Preserve | 27.3 |
| Name | Acreage |
|---|---|
| Bock Nature Preserve | 46.8 |
| Eastlake | 48 |
| Glennwood Nature Preserve | 36.7 |
| Name | Acreage |
|---|---|
| Draper | 32 |
| G. Richard and Mary H. Culp Nature Preserve | 20 |
| Grass Lake | 102 |
| Indian River Nature Preserve | 29 |
| Marsh Wren Nature Preserve | 50 |
| Martin Lake Nature Preserve | 5 |
| Quog Lake | 126 |
| Raber | 32 |
| Stark Nature Preserve | 41 |
| Name | Acreage |
|---|---|
| Walter H. and E. Marie Myers Nature Preserve on Flowers Creek | 157 |
| Name | Acreage |
|---|---|
| Art Hammer Wetlands | 356 |
| Clock Creek | 35 |
| Detering Nature Preserve | 54 |
| Florence Badger Nature Preserve | 36 |
| Kate M. Raber and James R. Johnson | 62 |
| Leatherman Family Natural Area | 6 |
| Nevin Nature Preserve | 99 |
| Ralph F. Gates | 1 |
| Richman Tipton Preserve at Little Lake | 24 |
| Sauga Swamp | 68 |
| Tamarack Nature Preserve | 10 |
| Name | Acreage |
|---|---|
| Black Swamp Audubon Sanctuary | 74 |
| Dunakin Woods | 26 |
| Flat Rock Creek | 50 |
| Name | Acreage |
|---|---|
| Motts | 57 |
| Name | Acreage |
|---|---|
| Disko Fen | 58 |
| Mary Thornton Nature Preserve | 15 |
| protected land | 96 |
| Name | Acreage |
|---|---|
| Anna Brand Hammer Reserve | 40 |
| Hurb and Francis Fuller Woods | 56 |
| Peace Farm Nature Preserve | 24 |
| Name | Acreage |
|---|---|
| Kessler Nature Preserve | 1 |
| Richey Woods Nature Preserve | 135 |
| Name | Acreage |
|---|---|
| Montpelier Woods | 14 |